Report of 103 rd MBAA Anniversary Convention

PIK Report No. 103

In this report we present a set of software components for distributed relation-based computations (SCDRC).We explain how SCDRC can be used to structure parallel computations in a single-program multiple-data computational environment. First, we introduce relation-based algorithms and relation-based computations as generic patterns in scientific computing. We then discuss the problems that have...

Technical Report Rd-ss-03-22

[Report of the 3(rd) European Brain Policy Forum].

RD-flatness and RD-injectivity

It is proved that every commutative ring whose RD-injective modules are Σ-RD-injective is the product of a pure semi-simple ring and a finite ring. A complete characterization of commutative rings for which each artinian (respectively simple) module is RD-injective, is given. These results can be obtained by using the properties of RD-flat modules and RD-coflat modules which are respectively th...

Early markers of retinal degeneration in rd/rd mice.

PURPOSE In the rd/rd mouse, the cell death of rod photoreceptors has been correlated to abnormal levels of the cyclic nucleotide cGMP within photoreceptors. Given that cGMP is required for opening of the cationic channels, there is the possibility that a high cGMP concentration would maintain these channels open, at a high energy cost for the retina. METHODS We investigated whether cation cha...